Foot-pump.



H. O. HARRISON. l

F001.A PUMP.

APPLICATION FILED JUNE 28, 1909.

Patented May 3, 1910.

wi tnaoozo UNITED STATES PATENT QFFIGE. I

HARRY OLIVER HARRISON, OF WICHITA, KANSAS.

FOOT-PUMP.

Specication of Letters Patent..

Patented May 3, 1910.

Application filed June 28, 1909. Serial No. 504,838.

ture, and easy to operate, and which will produce a continuous current of air.

With these objects in view the invention consists in a novel construction and arrangement of parts, to be hereinafter described and claimed, reference" being had to the drawing hereto annexed, in which Figure 1 is a side elevation of the pump, part-ly in section. Fig. 2 is eplen view. Fig. 3 is a sectional detail on the line 3--3 of Fig. 2.

In the drawing 5 denotes a base on which the pump mechanism is mounted. The base is of skeleton form, and has at its ends depending langes 6, to which the pump cylinders 7 are bolted or otherwise rigidly secured. Intermediate its ends, the base is formed with feet 8, on which it is Supporteda suitable distance above the iioor, so that the cylinders may clear the seme. The flanges 6 also serve to support the hase.

From the base, on opposite sides thereof, rise standards 9, to which is pivoted at 10 :L treudle 11. To the bottoni ot the treadle is bolted orotherwise fastened, e depending bracket arm '12, which is connected at its,

lower end to the piston rod 13, there being a series of openings 14 in the erm for-the purpose of adjustment. rIhe outer ends of the piston rods are fitted with heads 14', which are halved, the arm 12 being received therebetween and secured by a bolt 15 ex- -tending transversely' through said halved portions. and through one of the openings A 14. The rods 13 are connected to pistons 1G working in the respective cylinders 7, the front endsoi` the cylinders being open and facing each other.

Upon operating the treadle 11 the bracket arm 12 is oscillated, and, by reason of its connection with the piston rods, the pistons will be reciprocated in the cylinders, 'one plston making a suction stroke, While the other piston is expelling the air.

The outlet from the cylinders is by nipples 17 fitted thereto and connected by exible tubes 18 to the two branches 19 of a pipe 20. In the tubes 18 *are check valves 21. The pipe 2O is connected to the casing of another check valve 22, from which a. tube 23 leads to a. reservoir.

The check-valves 21 are short metal tubes containing e ball valve, said tubes being open at both ends, one end being the seat of the ball, and the other end being contracted to prevent the ball from coming out ofthe tube, there being side openings in the last mentioned end through which the air escapes. 'Ihe't-ubes 18 are preferably of rubber, and the valves 21 lit snugly therein, the being' held in place by frictionel Contact with the inner surface of seid tubes.

The valve 22 is mounted in an opening made in the base 5 and has at one of its ends a, screw-threaded portion v24: which screws into the pipe 20, and et its opposlte end is a nipple whereby connection with the tube 23 is made, the latter also bein of rubber. lIntermediate these points t e valve casing has an enlargement 25, which is engageeble with the top of the bese 'when said valve is in place. The outer surface of this enlargement is angular, in order that it may be readily teken hold of to screw the valve into the pipe 20. It will be noted that the check valve 22 is loczited ahead of the check valve 21 or between said check valve 21 and the reservoir, whereby a return iiow of the air is prevented. v

The reservoir may be a. rubber bulb 26 covered with e netting to limit the extent 0i its ination, and the reservoir is connected by means of e, pipe or tubin to the blowpipe, stomizer, or other air-b ast device.

What is claimed is n air pump comprising e base having dependin enges et its ends whereby it 1s su porte above the floor, axially alined cylin ers secured to the flan es, e. piston working ineech cylinder, ro connected to the 

